/Engine/Plugins/Runtime/nDisplay/Source/DisplayClusterScenePreview/Public/IDisplayClusterScenePreview.h
Set the path of theADisplayClusterRootActoractor for a renderer, which will be added to the preview scene and used to determine the render world. Whenever a render is performed with this renderer, it will try to find the actor at that path and use it as the root.
bool SetRendererRootActorPath ( int32 RendererId, const [FString](API\Runtime\Core\Containers\FString) & ActorPath, bool bAutoUpdateLightcards )